Dear Maintainer, *** Reporter, please consider answering these questions, where appropriate *** * What led up to the situation? Adding a description to a bridge interface. * What was the outcome of this action? Bridge interface failed to be created. # ifup br1 Cannot find device "br1" ifup: ignoring unknown interface br1=br1 This is a pretty critical bug as it can prevent access to a system with a bridged network interface. *** End of the template - remove these template lines *** --- /etc/network/interfaces.d/*: auto br1 iface br1 inet manual description nktest bridge_ports enp0s8--- up and down scripts installed: /etc/network/if-down.d: total 8 -rwxr-xr-x 1 root root 800 Sep 27 04:56 postfix -rwxr-xr-x 1 root root 332 Jun 2 2015 upstart /etc/network/if-post-down.d: total 0 lrwxrwxrwx 1 root root 29 Jul 2 21:20 bridge -> /lib/bridge-utils/ifupdown.sh /etc/network/if-pre-up.d: total 4 lrwxrwxrwx 1 root root 29 Jul 2 21:20 bridge -> /lib/bridge-utils/ifupdown.sh -rwxr-xr-x 1 root root 344 Jun 30 2016 ethtool /etc/network/if-up.d: total 20 -rwxr-xr-x 1 root root 610 Oct 4 2014 arping -rwxr-xr-x 1 root root 1685 Jun 30 2016 ethtool -rwxr-xr-x 1 root root 972 Jun 18 00:08 openssh-server -rwxr-xr-x 1 root root 1117 Sep 27 04:56 postfix -rwxr-xr-x 1 root root 1483 Jun 2 2015 upstart